public class Test {

    public static void main(String[] args) {
        Solution solution = new Solution();
        String s = "a";
        String t = "aa";
        char ret = solution.findTheDifference(s,t);
        System.out.println(ret);
    }

    public static void main2(String[] args) {
        Solution solution = new Solution();
        int[] array = {1,0,1,1};
        boolean flag = solution.containsNearbyDuplicate(array,1);
        System.out.println(flag);
    }

    public static void main1(String[] args) {
        Solution solution = new Solution();
        int[] array = {1,1,1,3,3,4,3,2,4,2};
        boolean flag = solution.containsDuplicate(array);
        System.out.println(flag);
    }

}
